Blue-print machine.



C. P. PHASE. BLUE PRINT MACHINE.

APPLICATION FILED JULY 19, 1912.

Patented Feb. 25, 1913.

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Y blue prints employ eser AvAlLAeu coe` CHARLES F. PEASE, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE C. F. PEASE COMPANY,

OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BLUE-PRINT MACHINE. i

' Application led July To all whom, t mayconoem:

Be it known that I, CHARLES F. Pnasn, a citizen of. the United. States, residing at Ghicago, in the county of Cook and State of Illinois, have invented certain new and 'useful Improvements in Blue-Print Machines, of which .the following is a specification.

rThis invention relates to a machine for making the like.

In the construction of machines for making 'photographic copies of drawings, such as or the like, it is customary to an endless belt which is ordinarily of 4cotton duck. This endless belt is photographic copies of drawings or formed I have foundA by experiencelthat this endless belt formed of cotton duck will' always creep or notwithstanding the fact that the rolls may be'mathematically adjusted to be parallel so that the longitudinal edgesof the endless belt will be exactly equal in length. This tendency of the endless belt to move laterally, cannot be overcome even by turning the samewrong side out. Although the exact reason is not known, yet it is believed that the lateral movement of the endlessbelt is due to the way in which the duck iswoven.

A great many different means have been devised to overcome the above referred to diliioulty. larly adjust the printing plate which engages the endless belt, to move. one end of the printing plate into firmer engagement with such endless belt when it tends tocreep in that direction. A great disadvantage encounteredin the employment'of such means and others of .similar character, is that the endless'belt .is worn out very quickly.

. r-ll-c function of this angularly adjustable is to make the finer adjustments ofthe slt. s prevent its lateral movement. If this move-i laterally, either to the left'or right,

Means have been devised to angu 1 f larly adjustable, rolltwe're not, provided,

Specification of Letters Yatent.` p Patented Feb, 25, i913.

19, 1912. Serial No. 710,473. l

the pitchv of the screw-threads ofthe main jroll or rolls would have to be different for cach endless belt.

An important object of this invention is to jprovide novel and simple means to prevent the lateral creeping of the endless belt of a vprinting machine. i d y A further object of the invention is to provide novel and adjustable means by the manipulationofwhich the lower rollcarry- 4ing the endlessbelt may. be accurately ad- :justed so that the lon itudinal edges of the `endless belt will be `o the same length and hence there will be no tendency of the belt to creep laterally, due to theimproper ladjustment of this roll.

Other objects and advantages of the in lvention. will be apparent during the course :of the following description.

In the accompanying drawings forming a part of this specification and inwhiehlike numerals are employed to designate like parts throughout the same, Figure 1 is a vcentral vertical sectional View through the machine, Fig. 2 is "an enlarged side view of means for supporting the lower roll, viewed `from the outer side of the machine, Fig. 3

is asimilar view of an adjustable bracketv for supporting the third smooth roll, and, Fig. t is a front elevation of the machine, parts being omitted for the sake of illustration.

In the drawings, wherein for the purpose of' illustration, I have shown a preferred embodiment of my invention, thenumeral 1 designates upstanding end pieces of castings forming the frame-work l or supporting structure'of the machine. AThe end pieces l are connected near their lower ends by horizontal transverse rods 2 and 3 and are con nected between their ends by a horizontal table't, as shown.

The numeral 5 designates a preferablyinclined transparent printing plate which is 'disposed within the upper portion of the frame-work andheld in place by suitable means. Disposed forwardly of this' printing plate is a source vof light 6, preferably an are lamp, as shown. i The end pieces l are providedattheir lupper, ends'with bearings-7, `through which is journaled an upper `horizontal rotatable shaft A8, havingv a bevel-gear 9 rigidlyvcon ich nected with one end thereof. The bevelgear 9 is engaged by a smaller bevel-gear 10, rigidly connected with a vertical operating rotary shaft 11, driven by any suitable means. Rigidly mounted upon the rotatable shaft 8 is an upper horizontal roll 12, provided throughout its entii'e length with screw-threads, as shown. I prefer to have the pitch ot' these screw-threads comparatively low. There are preferably twentyfour turns of the screw-threads to each inch of the roll and these screw-threads preferabllyuI have a depth of one sixty-fourth of an inc Disposed below the printing plate 5 is a lower horizontal rotatable shaft 13, sup- -ported by adjustable swinging arms 14.

Rigidly mounted upon the rotatable shaft 13 is a lower roll 15, provided throughout. its length with screw-threads, as shown, preferably the saine as those described in connection with the roll 12. Trained about the screw-threaded rolls 12 and 15 is an endless belt 16, preferably formed of canvas or what is known as No. 6 cotton duck.

Disposed near and below the roll 15 is a horizontal rock-shaft 17, journaled in openings formed through the end pieces 1, as shown. This rock-shaft 17 passes through openings formed in the adjustable swinging arms 14, which openings are disposed between the ends of these arms. The arms 14 are free to swing with relation to the rockshaft 17. Rigidly connected with the rockshaft 17 near and inwardly of the arms 14 are depending crank-arms 1S, having connection with the upper ends of depending rods 19. Rigidly mounted upon the outer surfaces of the crank-arms 18 and preferably cast integral therewith are transverse brackets 20 provided at their ends with laterally extending ears 21. These ears have screwthreaded openings formed therethrough to receive adjusting bolts 22, carrying clamping nuts 23 adapted to lockthe bolts 22 in adjustment at'diferent positions. The arms 14 are provided at their lower ends with lateral extensions or lingers 24, disposed between the adjusting bolts' 22. It is thus seen that by proper manipulation of the bolts 22 the arms 14 may be properly an ularly adjusted with relation to each ot ier and the shaft 17 and subsequently held in such adjustment at desired positions.

Pivotally mounted upon the horizontal rod 3 are bell-crank levers 25, upon the outer arms of which is mounted a -treadle 2G. Pivotally connected with the innerarms of these bell-crank levers are links 27, which in turn are pivotally connected with heads 28 attached to the lower ends of the rods 19. Pivotally connected with the opposite ends of the heads 2S are links 29, having connection with retractile coil springs 30, which are connected with Iixed eye-bolts 31.

Disposed upon the outer surface of the upper portions of the end pieces 1 are ver tically adjustable brackets 32, provided with elongated slots 33, for receiving clamping bolts 34. These brackets support an intermediate horizontal shaft 36, extending through elongated slots 26 and arran d between the main rolls 12 and 15. igidly mounted upon the shaft 25 is an auxiliary or third roll 37, which is preferably screwthreaded, as shown, and engages the inner surface of the endless belt 16, between the screw-threaded main rolls 12 and 15.

In the operation of the machine, the top roll 12 is rotated in the direction indicated by the arrow, whereby the endless belt 16 is moved in the same direction to conduct the sensitized aper and tracing fed to the lower end of said) endless belt upwardly across the printing plate 5, where it is subjected to the action of the light. lVhen the screwthreads formed upon the main rolls 12 and 15 are of the right pitch to overcome the lateral creeping of the endless belt, which is formed of cotton duck, the auxiliary roll 37 remains horizontal.

roll, which belt may be formed of a slightly different kind of cotton duck, it ma be found that the pitch of the screw-three s of the main rolls are either too low or too high, which results in the endless belt movin to the left or right, as the case may be. l nen this is the case the intermediate preferably screw-threaded roll 37 is angularly adjusted to raise or lower either end thereof, whereby the slight tendency that the endless belt will have to creep in that direction is entirely overcome. Attention is called to the fact that the slight angular adjustment of the intermediate roll 37 which is necessar to overcome the lateral creeping of the en less belt, is not sufficient to cause undue friction between said endless belt and the intermediate roll, whereby the endless belt will not be injured. The springs 30 through the intermediate elements hold the endless belt 16 in proper frictional engagement with the printing plate 5. By proper manipulation of the bolts 22, the arms 14 ma be angularly adjusted so that the roll 15 will be parallel to the roll 12, whereby the longitudinal edges of the endless belt will be of the same length. By forcing the treadle 26 downwardlyit is obvious that the lower roll 15 will be swung inwardly to slacken the endless belt 16.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same and that certain changes in the shape, size, and arrangement of part-s may be resorted to without departingfrom the spirit of the invention or the scope of 'the subjoined claims.

lVhen placin another. endless belt upon the screw-threa ed main A Having thus described`myinvention I claim l 1. In a machine of the character described, a supporting structure, a roll provided with'screw-threads, a second roll,an endless belt engaging the first and second named rolls, a printing plate en a ed by the endless belt, and a source of ig t disposed near the printing plate.

2. In ay machine of the. character described, a supporting structure, a printing plate, an endless belt engaging the printing plate, means to drive the endless belt including a roller provided upon 'its periphery with screw-threads, and a ,source of light disposed a suitable distance from tlm the printing plate, an angularly adjustable.'r

roll engaging the endless belt, and a source; of 4light disposed a suitable distance from the printing plate. 5. In a machine of the character described, a supportingstructure, a printing plate, rolls provided upon their peripheriesY with screw-threads and disposed near the endsof the printing plate, a cotton duck endless belt trained about the screw-threaded rolls and operating in engagement with the printing p]ate,`an intern'iediate roll disposed within the endless belt and engaging the saine between the screw-threaded rolls, i

means to angularly adjust the intermediate roll, and a source of light disposed a suitable distance from the printing plate.

(i. In a machine of the character de,- scribed, a sup ortingystructure, a printing plate, a plura ity of rolls, an endless belt engagingv the printing plate and.A trained l about the rolls, a'source of light disposedl a suitable distance from the printing plate, means for supporting one roll including arms, swinging 'crank arms, adjustable connecting means between the crank arms and arms, manually operated' means toswing the crank arms in one direction,v and a spring or springs to swing the crank armsi in a reverse direction.

7. Inv a .machine of the character vde- A scribed, a support-ing structure, a plate, a plurality of rolls, an end ess belt engaging the 'printing plate and trained about the rolls, a source of light disposed a suitable distance `from `the printing plate, means for supporting one roll including arm's, a horizontal shaft upon which the arms are mounted, Ycrank-arms 4mounted upon the horizontal shaft, adjustable con# necting meansbetween the crank-arms and arms, whereby the arms may be disposed at different angular positionsgwith relation to the crank-arms, and means to move .the crank-arms. j,

8. In a .machine of the character described, a supportingstruct-ure, a 'printing 'pla'te, a soure of light disposed near the 'piintii-igplate, an endless belt operating in engagement with the printing plate, driving'means for the endless belt, and an angularly adjustable screw-threaded roll engaging said endless belt. .v

S). In a machine of the character described, a supporting structure, a printing platepa source of light disposed near the printing plate, an endless belt operatinl in 'engagement with the printing plate, riv'- ing means for the endless belt including a plurality of. rolls,jat least one of'which is provided with screw-.threads upon its periphery, and an angularly adjustable screwthreaded roll disposed between said rolls in engagementwith the endless belt.l

In testimony whereof I atfix'my signature.

in presence of t'wo witnesses.

CHARLES F. PEASE. Witnesses; .il 'A Ensm' B, MILLS, Tuonns I can.

rinting 

